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WordReference Random House Learner's Dictionary of American English © 2024ar•du•ous /ˈɑrdʒuəs/USA pronunciation adj. - requiring great energy or exertion:arduous tasks.
- full of hardship;
severe:an arduous winter.
ar•du•ous•ly, adv. ar•du•ous•ness, n. [uncountable] WordReference Random House Unabridged Dictionary of American English © 2024ar•du•ous (är′jo̅o̅ əs or, esp. Brit., är′dyo̅o̅-),USA pronunciation adj. - requiring great exertion;
laborious;
difficult:an arduous undertaking. - requiring or using much energy and vigor;
strenuous:making an arduous effort. - hard to climb;
steep:an arduous path up the hill. - hard to endure;
full of hardships;
severe:an arduous winter.
- Latin arduus erect, steep, laborious; see -ous
- 1530–40
- 1.See corresponding entry in Unabridged hard, toilsome, onerous, wearisome, burdensome, exhausting.
- 1.See corresponding entry in Unabridged easy.
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